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Re: update-grub



I've taken a look at your new code now, so I can give a more reasoned 
reaction. Note: this still needs other ppl to look at.

The current sequence of actions by grub-installer is:
0. Update mtab in chroot to properly reflect mounted partitions
1. Install grub package
2. Run d-i's os-prober component to locate other OS's for multi-boot
   configuration
3. Ask where grub should be installed (default is MBR of first disk)
4. Run grub-install
5. Run update-grub to create initial menu.lst
6. Add any user parameters in menu.lst and re-run update-grub
7. Append extra menu items for other operating systems

With your new code I think this would change to:
0-4: probably unchanged?
5. Set user parameters in /etc/grub.conf
6. Drop file(s) with menu items for other OS's in /etc/grub/post.d/
7. Run update-grub

On Thursday 03 February 2005 07:26, Jason Thomas wrote:
> On Tue, Feb 01, 2005 at 11:24:26PM +0100, Frans Pop wrote:
> > > The rewrite does not include any device detection code. The idea
> > > was to put that into the postinst.

Hmmm. We are talking about the kernel root (device that has /boot), right? 
For that I think the postinst should be OK.

What about the groot? Would that still have to be passed to grub-install? 
Are you planning changes to grub-install as well?

> > That means that device detection would take place _before_
> > update-grub is run, correct?
> > Where would the results of the device detection be stored?
> > How would device detection be triggered again if there are hardware
> > changes (or even if the user decides to use udev or something like
> > that)?
>
> the new update-grub would read it's device information from
> /etc/grub/kernel.conf

Right.

> But I didn't really think about triggering a redetection. perhaps
> dpkg-reconfigure grub.

I feel this will need some consideration. Like trying to identify cases 
where redetection would be needed, if automatic redetection would be 
useful and where any checks for a changed configuration should be 
implemented (maybe there should be some sanity checks in update-grub 
suggesting to run dpkg-reconfigure if they fail).

> I was thinking that when the grub package was installed it would do
> some auto detection and then allow the user to modify the results. That
> way people with corner cases (such as raid) are covered.

Hmmm. One of the design goals of d-i is to reduce the number of questions 
as much as possible. For d-i, we would at least have to be able to run 
the postinst of grub non-interactive.
It would be nice if auto-detection were as complete as possible and if 
situations that can not be auto-detected would be signalled in some way 
(and not fall back to some default like now), so we would be able to ask 
the questions from within d-i only if needed.

Cheers,
Frans Pop

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